U.S. patent application number 10/224321 was filed with the patent office on 2003-02-27 for device for inserting a lens into an eye.
This patent application is currently assigned to ANTON MEYER & CO., AG. Invention is credited to Meyer, Rolf.
Application Number | 20030040755 10/224321 |
Document ID | / |
Family ID | 8184106 |
Filed Date | 2003-02-27 |
United States Patent
Application |
20030040755 |
Kind Code |
A1 |
Meyer, Rolf |
February 27, 2003 |
Device for inserting a lens into an eye
Abstract
A device for inserting a lens into an eye has a grip body (1)
with a lens holder (13) for holding the lens, and a plunger (2)
which can be displaced in the grip body (1) for guided insertion of
the lens into the eye. A ball-bearing bush (3) is arranged in the
grip body (1), the plunger (2) being mounted so as to be laterally
displaceable in this ball-bearing bush (3). This allows the device
to be operated using one hand, said device additionally having good
slide properties and permitting an at all times guided lateral or
rotational movement of the plunger.
Inventors: |
Meyer, Rolf; (Port,
CH) |
Correspondence
Address: |
BROWDY AND NEIMARK, P.L.L.C.
624 NINTH STREET, NW
SUITE 300
WASHINGTON
DC
20001-5303
US
|
Assignee: |
ANTON MEYER & CO., AG
Nidau
CH
|
Family ID: |
8184106 |
Appl. No.: |
10/224321 |
Filed: |
August 21, 2002 |
Current U.S.
Class: |
606/107 |
Current CPC
Class: |
A61F 2/167 20130101 |
Class at
Publication: |
606/107 |
International
Class: |
A61F 009/00 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 23, 2001 |
EP |
01 810 823.3 |
Claims
1. A device for inserting a lens into an eye, said device having a
grip body (1) with a lens holder (13) for holding the lens, and a
plunger (2) which can be displaced manually in the grip body (1)
for guided insertion of the lens into the eye, wherein a
ball-bearing bush (3) is arranged in the grip body (1), and the
plunger (2) is mounted so as to be laterally displaceable in this
ball-bearing bush (3), and the ball-bearing bush (3) is arranged in
the rear end of the grip body (1) directed away from the lens
holder (13).
2. The device as claimed in claim 1, wherein the ball-bearing bush
(3) is arranged in a fixed position in the grip body (1).
3. A device for inserting a lens into an eye, said device having a
grip body (1) with a lens holder (13) for holding the lens, and a
plunger (2) which can be displaced manually in the grip body (1)
for guided insertion of the lens into the eye, wherein a
ball-bearing bush (3) is arranged in the grip body (1), the plunger
(2) is mounted so as to be laterally displaceable in this
ball-bearing bush (3), and the plunger (2) has a guide groove (25)
into which there engages a guide element (6) arranged in the grip
body (1).
4. The device as claimed in claim 3, wherein the guide element (6)
is arranged in the ball-bearing bush (3).
5. The device as claimed in claim 1, wherein the ball-bearing bush
(3) is arranged in a fixed position in the grip body (1).
6. The device as claimed in claim 3, wherein the guide groove (25)
is rectilinear.
7. The device as claimed in claim 3, wherein the guide groove (25)
has a spiral (25') at least in the rear area of the plunger (2), so
that the plunger (2) can be rotated in a guided manner.
8. The device as claimed in claim 7, wherein the spiral (25') is
arranged in the rear area of the plunger (2).
9. The device as claimed in claim 7, wherein the grip body (1) has
a sleeve (10) and a grip front part (11) connected to the sleeve
(10) via axial bearings (8, 9), and a carrier (7) arranged in the
grip front part (11) engages in the guide groove (25) so that the
grip front part (11) can be rotated in a guided manner with the
plunger (2).
10. The device as claimed in claim 7, wherein the ball-bearing bush
(3) is arranged rotatably in the grip body (1) and can be rotated
in a guided manner together with the plunger (2).
Description
TECHNICAL FIELD
[0001] The invention relates to a device for inserting a lens into
an eye.
PRIOR ART
[0002] Nowadays, in ophthalmic surgery, opaque natural eye lenses
are replaced by artificial lenses. In this procedure, the patient's
opaque lens is first removed. The surgeon then introduces the
artificial lens into the eye with the aid of two forceps. The first
forceps is used to fold the lens, and the second forceps is used to
insert the lens. This demands that the surgeon have a very steady
hand and considerable practice in guiding the two forceps.
[0003] A device called an injector permits a certain degree of
guiding when fitting artificial lenses. This device for inserting a
lens into an eye consists mainly of a grip body and of a plunger
which can be displaced in the grip body via a thread. In the front
area of the grip body there is a lens holder into which a lens to
be inserted is placed. By rotating the plunger, this lens can then
be pushed through a front opening of the lens holder, the lens
being folded in the process. By further pushing, the lens is
introduced in the folded state into the eye. The thread indeed
permits exact guiding of the plunger. However, a disadvantage is
that the surgeon needs both hands in order to rotate the plunger.
Moreover, it is relatively difficult to hold the injector straight
during the rotation.
[0004] EP-A-0,477,766 moreover discloses a motor-driven injector. A
short push rod for guided insertion of the lens is present in a
grip body, the push rod being operatively connected to a
manipulator which is likewise arranged in the grip body. The
manipulator has a rotary drive mechanism in the form of a direct
voltage micromotor. The movement of the motor is transmitted as a
linear movement to the push rod via a spindle-nut drive. The push
rod is guided in the axial direction in the front area of the grip
body via a miniature ball-bearing. However, since the insertion of
a lens requires an extremely fine touch, practiced surgeons prefer
manually activatable operating instruments.
SUMMARY OF THE INVENTION
[0005] It is therefore an object of the invention to make available
a device of the type mentioned at the outset for inserting a lens
into an eye, which device can be operated manually and using one
hand and yet permits exact guiding of the plunger.
[0006] This object is achieved by a device having the features of
patent claim 1.
[0007] According to the invention, the plunger is mounted so as to
be laterally displaceable in a ball-bearing bush. In this way, the
manual injector can be operated using one hand. To manually
displace the plunger, it is necessary, as in the case of a syringe,
simply to exert a pressure on the plunger. By means of being
mounted in the ball-bearing bush, the plunger has improved slide
properties, which in turn permits an even advance movement of the
plunger and consequently an even insertion of the lens. The
arrangement of the ball-bearing bush in the rear end of the grip
body directed away from the lens holder avoids a lever effect in
the area of the guide and guarantees optimum weight
distribution.
[0008] Precise guiding of the plunger is guaranteed by a guide
groove which is incorporated in the plunger and into which there
engages a guide element arranged in the grip body.
[0009] In a first embodiment, the guide groove is of rectilinear
design, so that the plunger can be displaced in a guided manner in
a straight line.
[0010] In a second embodiment, the guide groove has a spiral, so
that the plunger can additionally be rotated in a guided manner
during displacement. If the spiral is arranged in the rear area of
the plunger, this rotation, at the end of the insertion movement,
allows the lens to unfold in the eye.
[0011] Further advantageous embodiments will become evident from
the dependent patent claims.
BRIEF DESCRIPTION OF THE DRAWING
[0012] The subject of the invention is explained below with
reference to preferred illustrative embodiments which are depicted
in the attached drawing, in which:
[0013] FIG. 1 shows an injector according to the invention in a
first embodiment;
[0014] FIG. 2 shows a cutout section from FIG. 1 in an enlarged
view;
[0015] FIG. 3 shows an injector according to the invention in a
second embodiment, and
[0016] FIG. 4 shows a cutout section from FIG. 3 in an enlarged
view.
PREFERRED EMBODIMENTS OF THE INVENTION
[0017] FIGS. 1 and 2 show an injector according to the invention in
a first embodiment. It comprises a grip body 1 in which a plunger 2
is displaceably mounted. Both grip body 1 and plunger 2 are
preferably made of metal, in particular titanium.
[0018] The grip body 1 has a sleeve 10 which is closed off at its
rear end by a closure cap 4. At its front end, the sleeve 10 merges
into a grip front part 11. In the example shown here, the grip
front part 11 is a separate component which is screwed to the
sleeve 10 via a first thread 17.
[0019] At its forward end directed away from the sleeve 10, the
grip front part 11 has a lens holder 13 for holding an artificial
lens. Behind the lens holder 13, the grip front part 11 has an
elongate, open insert window 12 through which the lens is fitted
into the lens holder 13. At its front end, the lens holder 13 has a
through-opening 13' through which the lens is pushed out. As can be
seen from FIG. 3, a window 13" can be formed in the lens holder 13
in order to check the position of the fitted lens.
[0020] The sleeve 10 preferably has a closed jacket. A ball-bearing
bush 3 is arranged in the rear area of the sleeve 10. This
ball-bearing bush 3 is enclosed by the closure cap 4, which is
screwed onto the sleeve 10 via a second thread 18. In this
illustrative embodiment, the ball-bearing bush 3 is fixed in
position relative to the sleeve 10. This can be achieved, for
example, by the closure cap 4, in contrast to the ball-bearing bush
3, not having a round cross section. In another variant, knobs are
arranged on the outer jacket of the ball-bearing bush 3 in order to
secure it against turning.
[0021] The ball-bearing bush 3 has a defined external diameter. It
preferably has metal webs cast into its jacket, protruding from the
jacket surface and extending in the longitudinal direction. In this
way, the ball-bearing bush 3 can also be made of plastic. The
ball-bearing bush 3 preferably has a plurality of ball bearings
extending in the longitudinal direction. Four ball-bearing tracks
distributed uniformly about the internal circumference have proven
expedient, these ball-bearing tracks extending at least
approximately along the entire length of the ball-bearing bush
3.
[0022] At its front end, the closure cap 4 has a protruding
peripheral flange 41 which, as in the case of a syringe, serves as
a finger support for the surgeon's fingers, preferably for the
index finger and middle finger. At the other end, the closure cap 4
is closed except for a through-opening 40. A second flange 5 is
preferably arranged on or integrally formed onto the sleeve 10 and
serves as a front limit stop for the surgeon's fingers. If, as is
shown here, the second flange 5 is a separate element which can be
secured in a releasable manner on the sleeve 10 via a fastening
screw 50 and is displaceable along said sleeve 10, then the
distance between the first flange and the second flange can be
adapted to the thickness of the surgeon's fingers.
[0023] The plunger 2 extends through the sleeve 10 and with its
rear end protrudes from the through-opening of the closure cap 4.
The plunger 2 consists mainly of a rear plunger head 23, a plunger
middle part 20, a plunger needle 21 and a plunger tip 22. The
plunger needle 21 is preferably connected releasably to the plunger
middle part 20, so that a new needle can be used depending on the
nature of the lens. In addition, it can also be used as a
disposable needle. The plunger tip 22 is arranged on or integrally
formed onto the tip of the needle 21. Its shape too varies
depending on the nature of the lens.
[0024] The plunger head 23 forms the rear end of the plunger 2. It
is connected to a finger ring 24. The plunger head 23 serves as a
surface for the surgeon's thumb to press on, in order to push the
plunger 2 forward laterally in the sleeve 10 using one hand. The
finger ring 24 makes it possible to return the plunger 2 using the
thumb, without having to change the position of the fingers holding
the injector. When the plunger 2 is pushed forward, the artificial
lens lying in the lens holder 13 is folded, pushed forward out of
the injector and fitted into the eye with precisely proportioned
pressure and in a guided direction. In FIG. 1, the injector is
shown with the plunger 2 advanced, after insertion of a lens.
[0025] The ball bearings of the ball-bearing bush 3 permit
low-friction displacement of the plunger. As its guide means, the
plunger 2 is provided with a rectilinear guide groove 25 which
extends at least along the entire path of displacement of the
plunger 2. In the example shown here, it extends along the length
of the plunger middle part 20. Arranged in the ball-bearing bush 3
there is a guide element 6, here in the form of a protruding metal
ball, upon which pressure is exerted so that it engages in the
guide groove 25 and thus prevents turning of the plunger 2 during
the advance movement. The guide element 6 can also be arranged
outside the ball-bearing bush 3, and in this case at least it is
acted upon by a spring. Such a guide element 6 is shown in FIGS. 3
and 4.
[0026] In order to prevent a dynamic pressure and consequently an
inhibiting counterforce on the plunger 2, the sleeve 10 also has at
least one relief chamber 14 in order to relieve the pressure of the
air which is compressed when the plunger 2 is pushed forward.
[0027] FIGS. 3 and 4 show a second embodiment of the injector
according to the invention. Identical parts are provided with the
same reference numbers as in FIGS. 1 and 2, so that these parts
will not be dealt with further here. In contrast to the first
embodiment, the plunger 2 has a guide groove 25 which is provided
at the rear end with a spiral 25'. The guide element 6 again
engages in the guide groove 25. If the plunger 2 is now advanced
until the groove passes into the spiral 25', the plunger 2 is then
rotated in a guided manner. In order to further guarantee the
bearing, the ball-bearing bush 3 in this embodiment is not fixed in
position, but instead is arranged rotatably on the sleeve 10 so
that it rotates together with the plunger 2.
[0028] In the embodiment shown here, the grip front part 11 rotates
together with the plunger 2. For this purpose, a grip middle part
15 is provided between grip front part 11 and sleeve 10, which grip
middle part 15 is connected to the sleeve 10 via a third thread 18.
A first axial bearing 8 is arranged between the grip front part 11
and the grip middle part 15, and a second axial bearing 9 is
arranged between the grip middle part 15 and sleeve 10. The second
axial bearing 9 is in this case held in its position by means of a
nut 16.
[0029] A carrier 7 is arranged in the grip front part 11. It is of
identical construction to the spring-mounted guide element 6 and
likewise engages in the guide groove 25 of the plunger 2. If the
plunger 2 is now rotated via the spiral 25', the grip front part 11
is also rotated through the connection via the carrier 7. This
rotation at the end of the insertion of the lens simplifies the
unfolding of the lens and its placement in the eye.
[0030] If only the plunger 2 is to be rotated, but not the grip
front part 11, then it is also possible to arrange a second spiral
on the plunger. The two spirals must then have the same distance as
the guide element 6 from the carrier 7. In addition, the length of
the plunger 2 is to be dimensioned such that the second spiral
comes to lie in front of the first guide element 6 when the plunger
2 is in the extended starting position, that is to say before the
start of the advance movement.
[0031] The device according to the invention can be operated using
one hand, said device additionally having good slide properties and
permitting an at all times guided lateral or rotational movement of
the plunger.
List of Reference Numbers
[0032] 1 grip body
[0033] 10 sleeve
[0034] 11 grip front part
[0035] 12 insert window
[0036] 13 lens holder
[0037] 13' through-opening
[0038] 13" window
[0039] 14 relief chamber
[0040] 15 grip middle part
[0041] 16 nut
[0042] 17 first thread
[0043] 18 second thread
[0044] 19 third thread
[0045] 2 plunger
[0046] 20 plunger middle part
[0047] 21 plunger needle
[0048] 22 plunger tip
[0049] 23 plunger head
[0050] 24 finger ring
[0051] 25 guide groove
[0052] 25' spiral
[0053] 3 ball-bearing bush
[0054] 4 closure cap
[0055] 40 through-opening
[0056] 41 first flange
[0057] 5 second flange
[0058] 50 fastening screw
[0059] 6 guide element
[0060] 7 carrier
[0061] 8 first axial bearing
[0062] 9 second axial bearing
* * * * *